P0175 on a Hyundai: Causes, Fixes & Repair Cost

🟠 Moderate severity · drivable

Drivable short-term, but a rich mixture can foul spark plugs and damage the catalytic converter if the code is left unfixed.

What P0175 means on a Hyundai

On a Hyundai, P0175 means the engine is running rich on bank 2 — too much fuel or too little air on the side opposite cylinder 1. Hyundai's V6 models have two banks, and this code points to the second one. The computer has cut fuel as far as it can and still sees a rich mixture.

Is P0175 common on Hyundais?

P0175 appears on Hyundai V6 models like the Sonata, Santa Fe, and Sorento, usually with higher mileage. Leaking fuel injectors are a frequent cause on these engines, and a dirty mass air flow sensor can also make the mixture rich. A slow oxygen sensor rounds out the usual suspects.

Commonly reported on: Sonata, Santa Fe, Sorento, Genesis.

Symptoms

Check engine light is on
Poor fuel economy
Fuel smell from the exhaust
Rough idle or hesitation

Common causes

most common: Leaking fuel injector on bank 2
common: Dirty or failing mass air flow (MAF) sensor
common: Slow or failing oxygen sensor on bank 2
less common: Fuel pressure too high
less common: Clogged air filter

How to fix it

Fix	DIY?	Typical cost
Clean the MAF sensor with MAF cleaner spray	Yes	$10–20
Replace the leaking injector on bank 2	Mechanic	$200–550
Replace the bank 2 upstream oxygen sensor	Yes	$70–220
Have fuel pressure checked	Mechanic	$100–300